Weighing scale



June 15 1926.

C. O. MARSHALL WEIGHING SCALE 2 Sheets-Sheet 2 Filed Feb. 14. 1923 HIEPatented June 15, 1926.

UNITED STATES 1,588,462 PATENT oFFlcE.

CHARLES O. MARSHALL, OI TOLEDO, OHIO, ASSIGNOR TO TOLEDO SCALE COMIANY,

OF TOLEDO, OHIO, A CORPORATION OF NEW JERSEY.

WEIGHING SC'ALE.

Application led February 14, 1923. Serial No. 618,901".

This invention relates to weivhino scales und particularly to scales ofthe so-called' lighthouse type having a coniniodity-receiving pan and aweight-receiving pan with automatic load-counterbalancing mechanismsupported in an upright housing between them', and one of its principalobjects is the provision of lever mechanism for a scale of this typewhich is so constructed and arranged that the pivots of the levers whichsupport the commodity-receiver and weightreceiver remain in the samehorizontal plane and remain the same distance apart throughout theweighing' movements of the mechau'ism.

.Another object of the invention is the ,nfovision of plat-form levermechanism in which the parts all move in the same' direction duringweighing movements;

Another object is the provision of a weighing scale of the so-calledlighthouse type in which the commodity-receiver and theweight-receivingr platter are held aga-inst tilting during weighingmove-ments without the use of check links or check link risers.

Other objects and advantages will be apparent from the followingdescription, in which reference is had to the subjoined claimsillustrating a. preferred embodiment of my invention and wherein similarreference numerals designate similar parts 'throughout the severalviews.

In the drawings Figure I is a front elevational view of a scaleembodyingrr my invention, part of the housingbeing broken away to showthe nechanism Figure II is a sectional plan view taken substantially onthe line II-II of Figure I;

Figure III is a sectional elevation taken substantially on the lineIII-III of Figure II;

Figure IV is a sectional elevational view taken substantially on thelline IV-IV of Firjure I;

Figure V is an enlarged fragmentary plan view showing `al jointin alconnection between the levers; and

Figure VI is an elevational View of the joint shown in Figure V, partsbeing broken away and parts shown in section.

Referring to the drawings in detail, the base- 1 of the scaleconstitutes a housing for the platform lever mechanism. whiehissupported upon twee-pairs of fulcmm brackets f2 and 3 secured, Vas isshown in Figure IV, to bosses 4 which are formed upon the interior ofthe base housingr l. The corresponding members of each pair of fulcrumbrackets are connected together by means of bars 5 which are preferablyformed integral with the fulcrum brackets. The distance between thefulcrums of the platform levers is thus readily and permanently fixed.One of the platform levers 6 is supported by means of knife edge pivots7 upon the fulcrum brackets 2 with one ofits ends extending into theright end of the base housing l, the end being bifureated and providedwith load pivots 8, while the other end ot the lever extends toward theleft and is provided with load pivots 9, the load pivots P and. 9 beingequidistant from the fulcruin pivots 7. y

Another lever l0 is supported by means of a knife edge pivot l1 on thefulcrum brackets 3,. with one of its ends extending into the left end ofthe base housing 1, where it isprovided with load pivots l2, and itsother end extending toward the right, where it is provided with loadpivots 13. The load pivots l2 and 13' of the lever l0 are equidistantfrom its fulcrum pivot. Supported upon the pivots 8 of the' lever 5 andthe pivots 13 of the lever 10 is a commodity-receiver supportingr spider14. It will be apparent as the description proceeds that the load pivots8 and 13 remain in the same horizontal plane and the same distance apartthroughout all the weighing movements of the scale mechanism. The spider14 may, therefore, if desired, be supported directly upon the pivots 8andi 13. I prefer. however, to support the spider from one 0f the leversby means of links such as are shown at l5. It will be observed that the.interposition of these links does not permit the Ispider 14 to swing orhave any movement in addition to that caused when it is forceddownwardly by thek weight of a load. Projecting upwardly from the spider1l through an opening in the housing l is a stem' 16r uponcthet upperend of which is secured a suitable commodity-receiver 17, 'nd supportedwithin tliehousing l beneath the spider 14: is a dash! pot 18 adaptedvto contain. oil. or other Huid and'having.- a plunger 19 which; issuitably eonnectedby means of :i plunger:- st'em 20 to the spider 1.4. y

Supported by munis" of links 21 upon the i L.; I)

load pivots 9 of the lever G and the load pivots 12 of the lever 10 isav spider 22 having a stem 23 which projects upwardly through anopeningin the housing 1 and supports a weight-receiving platter 24.

Supported centrally of the base housing 1 is an upright housing 25consisting of a column 26 expanded, as at 27, and terminating in a flatfan-shaped upper end 28. Secured. to the lever 6 and extending upwardlyinto the expanded portion 27 oi the housing 25 is a rigid arm 29, andsecured to the lever 10 and extending' upwardly int-o the eX- pandedportion ot the housing 27 is a similar rioid arm 80. lnlounted at theupper ends ol' the arms 29 and 30 are vertically ad- `instable plugs 31and 32, and connecting the plugs 31 and .32 by `means of ball bea-ringjoints B3 and 34 is a bar 35, the distance between' the axes of the ballbearing' joints and 34 being;v the same as the distance between theulcrum pivots 7 and 11, the load pivots 8 and 13 and the load pivots 9and 12.

rlhe mechanism so tar described constitutes an even balance scale. lf aload be placed in the commodity-receiver 17, the levers 6 and 10 willswing in a clockwise direction, the load pivots 8 and 13 remaining inthe same horizontal plane. es the commodity-receiver 17 is forceddownwardly by the weight of the load, the weight-receiving` platter 24will be elevated, but it will remain horizontal throughout its entiremovement. rlho weight of the load in the commodityreceiver 17 may be'counter-balanced by a like weight on the weight-receiving platter 24.The weight of the load will have the same effect regardless of itsposition in the commodity-receiver 17 and the counterbalancing weightwill have the same eiect regardless oil its position on theweight-receiving` platter 24. lf the load and the counterbalancingweight are in the respective centers ot the commodity-receiver andweightreceiving platter, no 'force will be transmitted through the barIt the load and the counterlmlancing weight are placed at the rightsides of the commodity-receiver and weight-receiving' platterrespectively, there will be no force transmitted through the bar 35, andthis will also be the case iii' the load and the counterbalancingvweight are placed at the left sides ot the commodi*ty-receiver andweight-receiving platter respectively. ll, however, the load be placedat the right side oi the commodity-receiver and the counterbalancingweight be placed at the left side oi, the weight-receiving platter, someforce will be transmitted. through the bar 35.

For the purpose or" facilitating maniacture, the levers o and 10 withthe arms 29 and 30 may be of identical construction and reverselyarranged as shown in Figures l and ll, and the spiders, Julcrum bracketsand tother parts which arel employed in Lessines pairs may also be ofidentical construction. it desired, however, one of the levers, pret'-erably the lever G, may be equipped with a tare beam 40, the tare beamsupporting` arms 41 and 42 projecting through suitable openings in thebase housing 1. A loadingbot; 4B may be placed upon the spider riheautomatic load-counterbalancing and indicating mechanism of the scaleconsists of a pendulum 44 equipped with an indicator hand 45 whichco-operates with a chart 46 located in the lan-shaped upper end ot thehousing' and visible from both sides of the scale Ythrough windows 47.Secured to the arm 30 is an extension 48 to which is connected ametallic ribbon 49 which overlies and is connected to a power sector 50,he power sector beingeccentric to the anis ot movement of the pendulum'for the purpose of causing equal arcuate movements ot' the pendulum incounterbalancing Vequal increments olf load on the commodity-receiver.The upper end of the extension 48 being considerably to the right olfthe airis of n'iovement of the lever 10, the upper end of the extension'ings downwardly and to the right as the lever swings in a clockwisedirection.

vWhen a load is placed in the commodityreceiver 17 the levers 6 and 10swing in a clockwise direction, thus swinging the arm SO and theextension 48 and exerting a pull upon the ribbon 49. Clockwise movementol the levers 6 and 1() continues until the pendulum 44 is swungn to aposition in which it counterbalances the load on the commodity-receiverand the weight of the load is indicated on the chart 46. Should it bedesired to weigh a load beyond the capacity of the automatic mechanism,part of the load may be counterbalanced by weights upon the platter 24,the remainder being,` counterbalanced automatically by the pendulum 44.

lllhile it will be apparent that the illustrated embodiment of myinvention herein disclosed is well calculated to adequately fullill theobjects primarily stated, it is to be understood that the invention issusceptible to variation, moditication and change within the spirit andscope of the subjoined claims.

Having; described .my invention, l claim:

1. In a weighingscale, in combination, a pair oit levers each having` aload pivot at each end, :tulcruin pivots for said levers, a pair otload-receivers each resting upon adjacent load pivots ot both levers, anupwardly extending arm fined to each lever and having a pivot locatedsubstantially above the Jiulcrum pivot of its lever, and a barconnecting the pivots of said arms.

2. In a weighing scale, in combination, a base, a pair of leversfulcrumed on said base a id having parallel axes of movement, each ofsaid levers having'a load pivot at each end, a pair of load-receiverseach resting upon adjacent load pivots of both levers, an uprighthousing supported by said base between said load-receivers, an arm fixedto each of said levers and extending upwardly ,into said housing, eacharm having a pivot located substantially above the fuloruni of itslever, and a bar connecting` the pivots of said arms.

3. In a weighing scale, in combination, a base, a pair of equal armlevers of equal length fulcrunied upon said base to swing upon parallelaxes, each of said levers having a load pivot at each of its ends, apair of load-receivers each resting upon the adjacent. load pivots ofboth levers, an upright housing on said base between saidload-receivers, an arm fixed to each lever and eX- tending upwardlywithin said housing, each of said arlns having a pivot locatedsubstantially above the fulcrum of its lever, and a bar connecting thepivots of said arms.

4. In a weighing scale, in combination, a base, a pair of. leverssupported thereby to swing on parallel axes, each of said levers havingload pivots at its ends7 a pair of load-receivers, each of saidload-receivers supported upon the adjacent load pivots of both levers,an upright housing between said load-receivers, each of said levershaving an arm extending into said upright housing, a bar pivotallyconnecting said arms, the distance apart of the pivotal connectionsbetween said bar and said arms being` substantially the same as thedistance between the fulcrums of said levers, a load-counterbal ancingpedulum supported by said housing, and means operatively connecting saidlevers and said load-counterbalancing pedulum.

In a weighing scale, in combination, a base, a pair of equal arm leverssupported by said base to swing on parallel axes, each of said levershaving load pivots at its ends, a pair of load-receivers each supportedon adjacent pivots of both lovers, an upright housing between saidload-receivers7 each of said levers having an arm fixed thereto, saidarms extending` upwardly within said hous ing, a bar pivotallyconnecting said arms, a load-counter-balancing pendulum supported bysaid housing, means connecting said pen-- dulun'i and one of said arms,and indicating means operated by said pendulum.

CHARLES O. MARSHALL.

